NullPointerException in method AbstractReadWriteEhcacheAccessStrategy.handleLockExpiry -------------------------------------------------------------------------------------- Key: HHH-6642 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6642 Project: Hibernate Core Issue Type: Bug Components: caching (L2) Affects Versions: 4.0.0.CR2 Environment: Hiberante4.0.0CR2, SQLServer 2008 Reporter: Guenther Demetz Assignee: Strong Liu Priority: Trivial Labels: ehcache Fix For: 4.0.0.next javax.persistence.RollbackException: Error while committing the transaction at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:90) at com.wuerth.phoenix.bcserver.base.PhoenixSession.executeCommit(PhoenixSession.java:642) at com.wuerth.phoenix.bcserver.base.PhoenixSession.transactionInternalCommit(PhoenixSession.java:546) at com.wuerth.phoenix.bcserver.base.PhoenixSession.transactionCommit(PhoenixSession.java:507) at com.wuerth.phoenix.bcserver.base.TransactionContext.commit(TransactionContext.java:260) at com.wuerth.phoenix.test.bart.roles.peers.RefreshOnTimestampTest.testcreateDanglingChildDueRefresh(RefreshOnTimestampTest.java:118) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at junit.framework.TestCase.runTest(TestCase.java:168) at junit.framework.TestCase.runBare(TestCase.java:134) at junit.framework.TestResult$1.protect(TestResult.java:110) at junit.framework.TestResult.runProtected(TestResult.java:128) at junit.framework.TestResult.run(TestResult.java:113) at junit.framework.TestCase.run(TestCase.java:124) at junit.framework.TestSuite.runTest(TestSuite.java:232) at junit.framework.TestSuite.run(TestSuite.java:227) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:91) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: org.hibernate.AssertionFailure: Exception releasing cache locks at org.hibernate.engine.spi.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:611) at org.hibernate.engine.spi.ActionQueue.afterTransactionCompletion(ActionQueue.java:211) at org.hibernate.internal.SessionImpl.afterTransactionCompletion(SessionImpl.java:527) at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.afterTransaction(TransactionCoordinatorImpl.java:145) at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.afterTransactionCompletion(JdbcTransaction.java:137) at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:182) at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:73) ... 24 more Caused by: java.lang.NullPointerException at org.hibernate.cache.ehcache.internal.strategy.AbstractReadWriteEhcacheAccessStrategy.handleLockExpiry(AbstractReadWriteEhcacheAccessStrategy.java:182) at org.hibernate.cache.ehcache.internal.strategy.AbstractReadWriteEhcacheAccessStrategy.unlockItem(AbstractReadWriteEhcacheAccessStrategy.java:158) at org.hibernate.cache.ehcache.internal.nonstop.NonstopAwareCollectionRegionAccessStrategy.unlockItem(NonstopAwareCollectionRegionAccessStrategy.java:206) at org.hibernate.action.internal.CollectionAction$CacheCleanupProcess.doAfterTransactionCompletion(CollectionAction.java:195) at org.hibernate.engine.spi.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:604) ... 30 more Scenario is following: Transaction - commit fails --> rollback --> open new Transaction --> commit --> reported NPE exception Fix: diff AbstractReadWriteEhcacheAccessStrategy.java /home/pb00067/hibernate-ehcache4.0.0CR2/src/org/hibernate/cache/ehcache/internal/strategy/AbstractReadWriteEhcacheAccessStrategy.java 182c182 < LOG.softLockedCacheExpired( region.getName(), key, lock.toString() ); --- > LOG.softLockedCacheExpired( region.getName(), key, lock != null ? lock.toString() : "null"); N.B.: As the fix is trivial, please save me this time from the duty to provide a testcase ;-)